Man Finds Tooth of Megalodon, Biggest Shark to Ever Live, ... An image can be seen below. ... but some sharks have as many as 15 rows of teeth in each jaw and can grow lost ones back in just one day.

The jaw has four shark's teeth that are more than 7 inches long — an extreme rarity. "I think there are probably less than 10 known in existence," Herskowitz said. Mysterious monster ...